Boiler



J. M. McCLELLON.

BOILER.

APPLICATION FILED APR. 6, 1915.

Patented May 25 1920 4- SHlzETS-SHEET l.

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J. M. McCLELLON.

BOILER.

APPLICATION FILED APR. 6, 1915.

Inventor:

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APPLICATION FILED APR. 6,1915.

W i W T/ y J. M. McCLELLON.

BOILER.

APPLICATION FILED APR. 5,1915. 1,341,475. Patented May 25, 1920.

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lnveniov: James ljfo Cieli on,

UNITED STATES PATENT OFFICE.

JAMES M. MOCLELLON, OF EVERETT, MASSACHUSETTS.

BOILER.

To all whom it may concern:

Be it known that I, J AMES M. MoCLELLoN, a citizen of the United States, and a resident of Everett, county of Middlesex, and State of Massachusetts, have invented an Improvementin Boilers, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to locomotive boilers and among other; objects aims to provide a simple and strong construction with parts readily accessible for purposes of replacement or repair. I

The character of the invention may be best understood by reference to the following description of an illustrative embodiment thereof shown in the accompanying drawings, wherein Figure 1 is a vertical longitudinal section through an illustrative boiler shown herein as embodying the invention;

Fig. 2 is a transverse section taken on the broken line 2-2 of Fig. 1;

Fig. 3 is a transverse section taken on the broken line 3-3 of Fig. 1;

Fig. 3 is a horizontal section through the flue and throat sheets; and I Fig. 4; is a transverse section taken on the broken line 44 of Fig. 1.

Referring to the drawings, the illustrative boiler shown therein comprises a barrel 1 containing flues 3, the rearends of which are expanded into a flue sheet connected by a throat sheet 7 to said barrel.

The barrel is circular in cross section whereas the fire box is larger and of a different shape. The flue and throat sheets are formed to present opposed portions projecting out beyond the side of the barrel. The flue sheet has a forwardly extending flange 9 riveted to a rearwardly extending flange 11 on said throat sheet and the latter has a flange 13 encircling and riveted to the, barrel. Since in the ordinary locomotive the firebox is at the-rear of the barrel the sheet 5 may for convenience in reference be called the hinder sheet in speaking of the chamber formed by sheets 5 and 7 Portions of the throat sheet and flue sheet extend beneath the barrel and may be strengthened by stays 15 (Fig. 1). The space at the bottom thereof may be closed by a portion of a mud-ring 17 secured to said sheets by through-rivets.-

Speeifieation of Letters Patent.

Patented May 25, 1920.

application filed April 6, 1915. Serial No. 19,571.

The rear wall of the fire-box comprises an inner sheet 19 and an outer sheet 21 provided with rearwardly extending overlapped flanges 28 and 25 riveted together to constituto the end and top closures of the wall. The bottom of the wall is closed by a portion of the mud-ring 17 secured to the outer and inner sheets by through-rivets.

To provide a fire-door the inner and outer sheets of the rear wall are formed to present inwardly extending overlapped flanges 29 and 31 riveted or welded together.

The side walls of the fire-box comprise series of; large thin-shelled metal tubes having their forward ends expanded or welded into apertures inthe marginal portions of the flue sheet projecting beyond the sides of the barrel. These tubes incline downward from the flue sheet and have their rear ends expanded or welded into apertures in the front sheet 19 of the rear wall.

To permit access to the forward ends of the tubes 33 for purposes of assembly, replacement, or repair the portions of the throat sheet opposite to said ends are provided with apertures in which are removable caps 35. It will be observed that these caps are located exteriorly of the fire-box and barrel where they may be readily and conveniently reached.

The crown of the fire-box as shown herein comprises a series of tubes 37 preferably somewhat larger in diameter than the tubes at the sides of the fire-box. The crown tubes have their forward ends expanded or welded into apertures in the flue sheet and extend therefrom downward and rearward substantially parallel to the side tubes and have their rear ends expanded or welded in apertures in the front sheet of the rear wall.

The portion of the flue sheet to which the crown tubes are attached is bent or offset out of the plane of the sheet into a plane perpendicular to the axes of said tubes to facilitate and strengthen the connection of said tubes with said sheet.

To permit access to the rear ends of the side and crown tubes for the purpose of assembly, replacement or repair, the outer sheet of the rear wall is provided with aper tures in which are removable caps 39, (Fig. 1).

As shown herein, the tubes at the sides and crown of the firebox are spaced somewhat and connected by fillers 41 welded thereto to form in efl'ect a continuous integral side and crown closure. Preferably, these fillers are located outward slightly from the centers of the tubes so the latter may present extensive steam generating surfaces.

Preferably the side tubes do not extend to the bottom of the fire box but terminate short spaces above the bottom, said spaces being closed by chambers formed of U- shaped plates 43 having rounded tops connected to the lowest of the series of the side wall tubes by fillers similar'to those described. The bottoms of the U-shaped chambers are closed by portions of the mud ring 17 referred to. The forward ends of the side wall chambers communicate with the barrel through apertures in the flue sheet and their rearward ends communicate with the interior of the rear wall through apertures in the inner sheet thereof.

To increase the flame length and heating eificiency of the gases of combustion in the fire box, a baffle or'arch may be introduced thereinl comprising a wall 49 (Fig. i) made of tiles resting on and supported by a series of tubes 51 having their lower ends expanded into the flue sheet adjacent the bottom of the barrel, said tubes inclining upward and rearward and terminating in curved ends 53 expanded or welded in apertures in the crown tubes 37 at substantial distances from the junctureof the crown tubes with the rear wall. The arch tubes are located centrally Within the fire box where they are subjected to high heats and consequently they are effective as steam generating tubes. In connecting the arch tubes to the crown tubes as described, they conduct highly heated water directly to the crown tubes at points where the water is substantially hotter than the water in the rear wall. 'As a result, they will promote the circulation of the Water up through the crown tubes.

To permit access to the lower ends of the arch tubes, the throat sheet may-have plugs 54 threaded therein opposite to said ends.

A feature of the invent-ion relates to means for conducting the water from the barrel to the end and side walls of the fire-box. To accomplish this an inverted dome or chainber 55 is secured to the bottom of the barrel and communicates therewith. Projecting laterally rearwardly from this chamber is a coupling 57 connected by a large pipe 59 With the rear Wall.

To facilitate the cleaning of the chamber 55 it may be provided with a blow-ofi' cook 61.

v this construction provision ismade for conducting a large volume of water from the barrel to the rear wall Without passing the same through the interior of the fire-box.

Normally, the Water level will stand sufficiently high in the barrel to keep all of the side and crown tubes submerged. If the water level should drop, at first merely small portions of the crown tubes would be uncovered because of their inclination downwardly and rearwardly.

The steam will rise from the level of the water in the barrel into the space above it. To furnish additional steam space there maybe provided one or more drums 63 having their rear ends closed by bumped heads (35 and their forward ends provided with heads 67 formed to prevent nipples 69 riveted to forwardly extending flanges in the flue sheet. This will permit the steam to pass readily from the space in the upper portion of the barrel into said drums. The forward heads of the steam drums may be riveted to the flue sheet and their rear ends may be mounted on tube supports 70 resting in feet on the top of the rear wall and communicating therewith;

To conduct the steam from the drums there are provided pipes 71 connected to the drum heads 67 and connected in turn by an extensible connection 79 with the usual steam dome partially shown at 81.

The steam may be conducted from the steam dome and from the space at the top of the barrel to usual return superheating tubes (not shown) contained in flues 83 having their ends expanded into apertures in the flue sheet to receive the gases of combustion from the fire-box.

The tubes employed in the side walls and crown of the fire-box may be of standard sizes, and consequently they can be assembled merely by expanding or welding their front and rear ends in the flue sheet and in the front sheet of the rearwall.

Important advantages of the "boiler are the ease with which it may be inspected and the ease with which replacement or repalr of parts can be made. To inspect or repair a side wall tube it is merely necessary to remove the caps at the opposite ends thereof.

The front cap is accessible exteriorly of the boiler at the side of the barrel, whereas the rear cap is accessible at the outer sheet of the rear wall.

The front ends of the crown tubes are conveniently accessible for inspection from the large space in the barrel above the fines therein, while the rear ends of said crown tubes are conveniently accessible for inspeccrown. This circulation will tend to prevent the deposi't'of any sediment or incrustation on the inner walls of the tubes, but if such deposit should be made it may be readily cleaned out through the conveniently accessible cap openings at the opposite ends of the tubes. Any loose foreign matters in the water will gravitate down and be caught either in the chamber at the bottom of the barrel where it is pocketed and readily cleaned out, or gravitate down to the chambers above the mud ring the front, rear and side walls where it may be readily flushed out through the plug openings adjacent the mud ring.

All of the sediment and foreign matters are deposited in the lowest parts of the boiler beneath the grate and since such parts are not subjected to high heats there is no danger of burning them out.

The crown and sides of the fire-box are extremely strong and able to withstand the rack and strain which locomotive boilers necessarily experience. It will be observed that there are no stays employed in the boiler, with the exception of the very few between the lower portions of the throat and flue sheets, in the U-shaped chambers and between the outer and inner sheets of the rear wall. The stays in these places are not objectionable since they are not subjected to high heats.

All of the side and crown tubes present active steam generating surfaces which liberate their steam directly into the barrel without the necessity of the water passing from one tube to another.

Since the entire boiler can be so easily and perfectly inspected, the cost of repairs and maintenance is reduced to a minimum. Because of the great accessibility to the parts,

the inspection may be very quickly made,

and therefore the cost of inspection and the loss of service of the locomotive during inspection are reduced to a minimum.

Having described one illustrative embodiment of the invention without limiting the same thereto, what I claim as new and desire to secure by Letters Patent is 1. The combination of a barrel with a fire-box comprising side and crown tubes connected to close the sides and crown of the fire-box and communicating with said barrel, said tubes inclining downwardly and rearwardly therefrom, and steam drums located above the' fire-box and communicating with said barrel and with the water spaces of the fire-box.

2. The combination of a barrel with afire-box comprising crown and side wall tubes connected to close the sides and crown of the fire-box and inclined downwardly and rearwardly from said barrel, and a steam drum above and separate from the fire-box having communication with said barrel and with the water spaces of the fire-box.

3. The combination of a barrel with its flue sheet, a fire-box comprising a series of tubes connectedto form a crown closure and inclined downwardly and rearwardly from said flue sheet, a series of arch tubes projecting upward from said flue sheet to said crown tubes and a battle wall supported by said arch tubes.

4. The combination of a barrel with a fire-box having a hollow rear wall and crown tubes inclined downward from said flue sheet to said rear wall, arch tubes inclined upward and rearward from said flue sheet and connected to said crown tubes a substantial distance from said rear wall, a battle wall supported by said arch tubes, and plugs removably mounted in said crown tubes opposite to said arch tubes.

The combination of a barrel with its fine sheet, a fire-box having a rear wall, and side-wall and crown tubes inclined downward from said flue sheet to said'rear wall, a steam drum having its forward end connected to and communicating with said barrel and a hollow standard resting on said rear wall for supporting the rear end of said steam drum. 3

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES M. MQCLELLON.

lVitnesses HENRY T. VILLIAMS, ROBERT H. KAMMLER. 

